It's Eastern that serve the IOM not Flybe. The latter gave it up years ago. Eastern only cater for businessmen. This is clearly pitched at the leisure end however Easyjet started from LPL-IOM in a similar fashion and it's now daily. As for the 319 not being suitable for short sectors..what about GLA then - seems to work just fine. I'd also wager the fares will be less than half that offered by Eastern.